Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-43379

Severity CVSS v4.0:
Pending analysis
Type:
CWE-416 Use After Free
Publication date:
08/05/2026
Last modified:
19/05/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()<br /> <br /> opinfo pointer obtained via rcu_dereference(fp-&gt;f_opinfo) is being<br /> accessed after rcu_read_unlock() has been called. This creates a<br /> race condition where the memory could be freed by a concurrent<br /> writer between the unlock and the subsequent pointer dereferences<br /> (opinfo-&gt;is_lease, etc.), leading to a use-after-free.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
9.80
Severity 3.x
CRITICAL

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.6.32 (including) 6.6.130 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.9 (including) 6.12.78 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.18.19 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.19 (including) 6.19.9 (excluding)
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools